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Related Experiment Video

Updated: Feb 24, 2026

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Intrinsic position uncertainty impairs overt search performance.

Yelda Semizer1, Melchi M Michel1

  • 1Department of Psychology, Rutgers University, New Brunswick, NJ, USA.

Journal of Vision
|August 25, 2017
PubMed
Summary

Intrinsic position uncertainty (IPU) significantly limits visual search performance, especially in cluttered displays. This study characterized IPU

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual search is fundamental to daily tasks.
  • Perceptual limitations cause uncertainty in target localization.
  • Sources of uncertainty include intrinsic and extrinsic factors.

Purpose of the Study:

  • To characterize the role of intrinsic position uncertainty (IPU) in overt visual search.
  • To determine if IPU significantly limits human search performance.
  • To model search performance constrained by measured IPU.

Main Methods:

  • Preliminary detection experiment to measure visual field sensitivity.
  • Visual search task with Gabor targets in synthetic luminance noise.
  • Two clutter conditions (Cluttered and Uncluttered) modulated IPU effects.

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  • Derived an IPU-constrained ideal searcher model.

    • Main Results:

    • In Uncluttered displays, search performance decreased with increasing set size.
    • In Cluttered displays, IPU dominated, and performance remained constant across set sizes.
    • The IPU-constrained ideal searcher model predicted human performance trends.

    Conclusions:

    • Intrinsic position uncertainty substantially limits overt visual search performance.
    • The impact of IPU is particularly pronounced in crowded visual displays.
    • Understanding IPU is crucial for explaining limitations in visual search efficiency.